Countertop water treatment unit

ABSTRACT

An improved residential countertop water treatment unit for producing potable water suitable for human ingestion such as by drinking or cooking comprises a vertical arrangement of a base, a cartridge, and a spigot at the top. The base includes an elongated threaded stub pipe extended downward for fastening the base to a sink surface or countertop and for receiving water from a potable cold water supply line. The base includes an internal valve for controlling water flow between the elongated threaded stub pipe and the inlet of the water filter cartridge. With the valve closed, the cartridge may be readily exchanged by simply unscrewing the spent cartridge from the base and then screwing in a new cartridge.

BACKGROUND OF THE INVENTION

[0001] This invention relates to a water treatment apparatus. More particularly, it relates to a water treatment unit for use as a residential countertop filter for producing potable water suitable for human ingestion such as by drinking or cooking, having a water-treating cartridge, which is easily replaced and discarded at the end of its useful life.

[0002] Wide varieties of water treatment devices are known in the prior art and most have filtration unit cartridges that are difficult and messy to replace, where water is readily spilled. Typically employed countertop residential or office water filters consist of a vertically oriented cylinder, which receives water from a diverter valve attached to a sink faucet and introduces tap water to the filter and dispenses the treated water from a spigot. The tubing interconnecting the diverter valve and the filtration unit is typically obtrusive and inconvenient for those people working near the sink.

[0003] Moreover, the configuration is bulky and requires that the filter units be inconveniently located adjacent to the sink where they interfere with routine tasks such as washing dishes or food preparation. Since water often collects on the countertop and behind the faucet during normal use of the sink, countertop water filters such as that shown in U.S. Pat. No. 5,277,805 make it difficult to clean up this collected water and subsequently allow the growth of mold and bacteria on the sink surface.

[0004] In another example, the water filter known from U.S. Pat. No. 5,685,981 consists of two parts: a base and a cartridge. The cartridge contains multiple water channels directing water to the water treating material, and is screwed into a socket in the base. The cartridge is exchanged by unscrewing the old cartridge from the base and then screwing the new cartridge into the base. The construction of this cartridge and base is complicated, comprises inconvenient tubing, and is expensive to produce.

[0005] An additional disadvantage to the countertop water filters known in prior art is that the required water supply connection at the end of the sink faucet is not possible with modern faucet designs.

BRIEF SUMMARY OF THE INVENTION

[0006] Accordingly, it is a primary objective of the present invention to provide a long lasting water treatment unit with a simple and inexpensive construction that corrects the listed disadvantages.

[0007] The present invention provides a countertop water treatment unit comprising a vertically oriented, elongated water treating cartridge and a base. The base receives the cartridge, within which is enclosed a water treating material. The base includes an elongated threaded stub pipe, which extends downward from underneath the base. The construction of the stub pipe has dual functionality. First, it fastens the base to the sink surface or any other countertop. Second, it receives potable water from an undersink cold water supply line. The base includes water passages in a fluid flow connection with the inlet of the water-treating cartridge. The base further includes a valve controlling the water flow through the water-treating cartridge. The top end of the elongated water treating cartridge comprises a port with a socket for a means of dispensing the treated water. The cartridge may have various forms adopted for use in several configurations. The valve may have a different construction and location. The base may take on different embodiments.

[0008] The present invention provides a water treatment unit with several unique advantages and superior features:

[0009] The present invention provides a solid structure firmly secured to the sink surface or countertop preventing it from being knocked down or misplaced;

[0010] The separate construction of the water treatment unit from the sink faucet allows it to be installed on a sink independently of the type of faucet because many modem faucets do not allow for on-faucet filter installations;

[0011] The present invention allows for full sink functionality and usage even during the water treatment operation;

[0012] The present invention is easy and inexpensive to produce because it constitutes an integral construction and it avoids unnecessary parts such as external tubing or on-faucet installation kits that often interfere with kitchen activities;

[0013] The construction of the present invention prevents water spillage during replacement of the treating cartridge;

[0014] The present invention avoids leakages and inconvenient undersink cartridge replacement;

[0015] The construction allows the treatment cartridges to be easily replaced by anyone without any tools.

[0016] Additional objects, features, and advantages will become apparent from the following description and appended claims.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0017]FIG. 1 is a partial cross-sectional view substantially taken along the longitudinal axis of the water treatment unit in accordance with the invention.

[0018]FIG. 2 is a partial cross-sectional view taken along the longitudinal axis of the water treatment unit mainly illustrating the base portion of the unit in another configuration in accordance with the invention.

[0019]FIG. 3 is a full cross-sectional view taken along the longitudinal axis of the water treatment unit illustrating the base and cartridge of the unit in still another configuration in accordance with the invention.

[0020]FIG. 4 is a partial cross-sectional view taken along the longitudinal axis of the water treatment unit similar to FIG. 2, illustrating the base and cartridge of the unit in still another configuration in accordance with the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0021] The inventive countertop water-treating unit is illustrated in its fully assembled condition in FIG. 1, FIG. 2, FIG. 3, and FIG. 4, consisting of four different configurations.

[0022] The water treatment unit shown in FIG. 1 comprises a vertically oriented, elongated water treating cartridge 20 having a plastic shell filled with activated carbon, which is insertable in a base 30 made of externally chromed and polished brass. The base 30 having a water inlet passage 37 and a water outlet passage 36 aligned with the cartridge inlet opening, contains a valve 50 for controlling water flow through the unit. The valve 50 is a needle valve and allows regulation of water flow through the cartridge 20 by spinning the knob 51. The base 30 includes a threaded cylindrical female socket 33 in which is inserted the cartridge 20 having a stub pipe 28 on the water outlet end 22 and fastening thread 21 a on the water inlet end 21. The filtrated water outlet means 10 in the form of a spigot is connected to the outlet stub pipe 28 of the cartridge 20 by its fitting 85. The leakage of water between the base 30 and the inlet end 21 of the water treatment cartridge 20 is prevented by a silicone ring 75 lying on the bottom of the socket 33. For optional permanent fastening of the base 30 to any surface, the base 30 possesses a threaded stub 62. For movable use, the unit includes a support stand 61 connected to the base 30 by fitted snap fastener. In this configuration, cold water from the undersink water supply line through a commercially available poly flex connector (not shown) enters the unit through the inlet passage 37. The water inlet passage 37 is in fluid communication with socket 33 through horizontal passage 35, controlled by valve 50 and through the outlet passage 36. Because the contact surface between the cartridge 20 and the socket 33 are sealed by ring 75, water is forced to flow longitudinally/axially through the water treating cartridge 20. Water passes internally through the cartridge 20, then through the stub pipe 28 and fitting 85 to flow out from the spigot 10. By spinning the knob 51 to the stop point, the valve will stop the water flow through the cartridge 20. The cartridge 20 is readily exchangeable by simply unscrewing it from the base 30 and screwing a new one into the base 30.

[0023] Other embodiments of the water treatment units are shown in FIG. 2 and FIG. 4. Both embodiments are similar to each other whereby it will also be apparent that a number of variations and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, the foregoing description is to be construed as illustrative rather than limiting. In general, both water treatment units shown in FIG. 2 and FIG. 4 comprise a vertically oriented, elongated water treating cartridge 20 having a plastic shell filled with activated carbon insertable in a base 30. The bases include a combined means 40 extended downward. The combined means 40 is provided for receiving water from a potable cold water supply line and for fastening the bases to a sink surface 100 or the like. Each of said bases includes a valve 50 for controlling water flow through said water treating cartridge 20.

[0024] The base shown in FIG. 2 is made of externally chromed brass. The combined means 40 extended downward from the base 30 constitutes a brass pipe. The brass pipe 40 a, comprising fastening threads 41, is inserted and welded into the base 30. For fastening the base to a sink surface 100 or the like, the corresponding brass nut 65 and plastic sealing ring 60 are provided on the brass pipe 40 a. The brass pipe 40 a extended downward from the base 30 includes an internally threaded inlet port 43 for receiving water from a water supply line (not shown) through a small diameter, commercially available, poly flex connector. The valve 50 inserted in the base 30 is a slide valve located between the water inlet passage 37 and water outlet passage 36. The stem 55 of the slide valve 50 comprises an asymmetrical opening 56 for regulating water flow through the water treating cartridge 20. From the top, the base 30 comprises a threaded cylindrical female opening 33 for receiving the inlet end of the water treating cartridge 20.

[0025] The cartridge 20 shown in FIG. 2 has a housing made of a suitable plastic cylinder 20 a closed on the ends with caps 25 and 26. The bottom end cap 25 comprises a short threaded inlet stub pipe 27, which is inserted into the female threaded opening 33 of the base 30. The cartridge 20 further comprises a smaller outlet stub pipe 28 extending from the top cap 26. In addition, the unit comprises a decorative chromed cover 90 which covers the water cartridge 20. On the top end of the cartridge, a spigot 10 and its fitting 85 are further installed on the stub pipe 28. The unit, preferably mounted on the sink surface 100, is secured to the sink by a nut 65. Potable water from the cold water supply line enters the threaded brass pipe 40 a through a poly flex connector (not shown) and through the brass pipe's opening 42. Next, the water flows through the base inlet passage 37, the valve's opening 56, and the base outlet passage 36 into the base's threaded opening 33. Because the water treating cartridge stub pipe 27 is threaded into the threaded opening 33 in the base 30 and sealed with ring 75 on the contact surface 39, water is forced to flow longitudinally through the cartridge 20, where it enters the cartridge outlet stub pipe 28, then through the fitting 85 to flow out through the spigot 10. The cartridge 20 is easily exchangeable by simply unscrewing the spigot with its fitting 85, removing the decorative cover 90, and unscrewing the cartridge 20 from the base 30 and screwing in a new one.

[0026] The similar base 30 shown in FIG. 4 having combined means 40 and valve 50 constitutes an integral/monolithic piece made of externally chromed and polished brass. The monolithic piece can also be made of another suitable material such as plastic. The valve 50 is similar to the needle valve as described on FIG. 1. The socket 33, for receiving the end 21 of the water treating cartridge 20, comprises a drainage opening 31, plugged with a screw plug 70. To prevent leakage, a silicone ring 75 lying on the surface 34 in the socket 33 is provided. Also, the plastic sealing ring 60 and nut 65 is provided for fastening the unit to a sink surface 100 or the like.

[0027] The water treating cartridge 20 shown in FIG. 4 is substantially in the form of a cylinder and comprises fastening threads on the inlet end 21 and on the outlet end 22. The threaded top end 22 of the cartridge 20 comprises a washer 23 to prevent water leakage and possesses an internally threaded cap 80 with its sealing flange 81. The cap 80 is ended with a stub pipe 82 possessing a water flow passage 83. On the stub pipe 82, there is a spigot 10 screwed with a nut 85. When the valve 50 opens, water enters through the opening 42, passage 37, the valve's channel 35, and flows through the passage 36 to the socket 33. Further, the water is then forced to flow through the water treating cartridge 20. The silicone ring 75 lying on the bottom surface 34 in the socket 33 forms a seal with the circular surface of the cartridge 20 thereby preventing leakage. Water passing the cartridge 20 enters the passage way 83 in the cap 80 and flows out through the fitting 85 and the spigot 10. When the cartridge is being replaced, the end cap 80 is unscrewed and saved for reinstallation. The old cartridge 20 is unscrewed from its socket 33 in the base 30 and the new cartridge 20 is screwed in. The saved end cap 80 with its spigot 10 and fitting 85 is screwed back on the top end 22 of the new cartridge 20. The ability to unscrew the plug 70 and drain the water treatment unit provides a means to prevent spillage, check the condition of the sealing ring 75, and clean out the socket 33 if needed.

[0028] Still another embodiment of the water treatment unit is illustrated in FIG. 3. The unit comprises a vertically oriented hollow cylindrical water treating cartridge 20, a filtrated water outlet means 10, a base 30 having an interior for receiving an end of the hollow cylindrical water treating cartridge 20, and a removable housing 91 with one open end enclosing the water treating cartridge 20 on the base 30. The base 30, having a cylindrical exterior, includes a combined means 40 extended downward from the base 30. The combined means 40 is provided for fastening the base 30 to a sink surface 100 or the like and for receiving water from a potable cold water supply line. The base includes a valve 50 for controlling water flow through the water treating cartridge 20. The base 30 and the cup shaped housing 91 are preferably made of a plastic such as polypropylene and may be of other suitable materials. The base 30 having a raised boss 54 on one side comprises a central protrusion 32 for receiving the end of a water treating cartridge 20. The combined means 40 that extends downward from the bottom of the base 30 is for fastening the base 30 to a sink surface 100 and for receiving water from an undersink water supply line (not shown). The combined means 40 and the base 30 constitute a monolithic and integral structure. The combined means 40 is in the form of a stub pipe and comprises fastening threads 41 and a corresponding nut 65. The base 30 includes a water flow inlet passage 37 and outlet passage 36. Between the inlet 37 and outlet 36 water flow passages is an internal slide valve 50, which is positioned for stopping water flow when treated water is not dispensed. The slide valve 50 comprises a cylindrical but not axially symmetrical opening 56 on its slide rod 55. When the handle button 52 is pushed to the boss 54, water flows between the inlet 37 and outlet 36 passages through the opening 56 in the valve rod 55. Water flow intensity may be regulated by spinning the knob 52 of the valve 50. The unit includes a commercially available hollow cylindrical water treating cartridge 20 enclosing a water treating material such as porous activated carbon. The cup shaped housing 91 encloses the hollow cylindrical elongated cartridge 20 inserted in the base member 30. The base 30 and the housing 91 comprise corresponding fastening threads 92 for retaining the housing 91 in the base 30. The housing 91 on its top closed end comprises a small threaded stub pipe 93 and fitting 85 for retaining a spigot 10. A plastic sealing ring 60 and brass nut 65 are provided to enable the base 30 to securely sit upon a sink surface 100 or countertop. In this configuration the longitudinally hollow cylindrical cartridge 20 is installed within the housing 91 and is secured in the base 30. The central protrusion 32 in the base 30 serves to maintain the cartridge 20 in its correct position within the housing 91. The open end of the housing 91 is slightly flared and externally threaded. The open end of the housing 91 is threaded into the base's threaded opening and sealed by the ring 75 sitting in the base groove. Both ends of the cartridge 20 are pressed by sealing flanges of the base 30 and of the housing 91 when the housing 91 is threaded into the base 30. Water flow at the ends is then blocked. The water enters into the space 94 in the same manner as described in FIG. 2. Water in the space 94 surrounds the hollow cylindrical cartridge 20 and because the flow on the ends is blocked, water is forced to flow radially through the porous filter cartridge and up its central passage where it enters the passageway in the stud pipe 93 on the top of the housing 91. Filtrated water is dispensed from a spigot 10 attached to the stub pipe 93 with its fitting 85 screwed on the threaded stub pipe 93. The hollow cylindrical cartridge 20 may be readily exchanged by simply unscrewing the housing 91 from the base 30, taking out the old cartridge, inserting a new one and screwing back the housing 91 into the base 30. During the exchange process, the drainage passage 31 a provides a means for the water to drain from the water treatment unit to prevent spillage, check the condition of the sealing ring 75, and clean out the socket if needed. 

What is claimed is:
 1. A countertop water treatment unit comprising at least a vertically oriented water treating cartridge, filtrated water outlet means, and a base having water passages and means for receiving an inlet end of a water treating cartridge; characterized in that said base (30) includes a valve (50) for controlling water flow through said water treating cartridge (20).
 2. The unit as set forth in claim 1; characterized in that said base (30) includes a threaded stub (62) for fastening said base (30) to a sink surface or the like.
 3. The unit as set forth in claim 1; characterized in that said unit further includes a support stand (61) connected to said base (30) preferably by a fitted snap fastener.
 4. The unit as set forth in claim 1; characterized in that said water treating cartridge (20) comprises a stub pipe (28) on the water outlet end (22) and fastening thread (21 a) on the water inlet end (21).
 5. A countertop water treatment unit comprising at least a vertically oriented water treating cartridge, filtrated water outlet means, and a base having a means for receiving an inlet end of a water treating cartridge; characterized in that said base (30) includes: a combined means (40) extended downward for fastening said base to a sink surface or the like, and for receiving water from a potable cold water supply line, and a valve (50) for controlling water flow through said water treating cartridge.
 6. The unit as set forth in claim 5; characterized in that said combined means (40) extended downward from said base includes fastening threads (41) with a corresponding nut (65).
 7. The unit as set forth in claim 5; characterized in that said combined means (40) extended downward from said base (30) constitutes a threaded pipe (40 a) inserted into said base.
 8. The unit as set forth in claim 5; characterized in that said base (30) and combined means (40), extended downward from said base (30), constitute a monolithic structure.
 9. The unit as set forth in claim 5; characterized in that said unit further comprises a decorative cover (90) surrounding said water treating cartridge (20).
 10. The unit as set forth in claim 5; characterized in that said water treating cartridge (20) comprises a stub pipe on both ends, preferably with a greater stub (27) on the inlet end and smaller stub (28) on the outlet end.
 11. The unit as set forth in claim 5; characterized in that said water treating cartridge (20) comprises fastening threads on the inlet end (21) and outlet end (22).
 12. The unit as set forth in claim 5; characterized in that said valve (50) constitutes a slide valve with rod (55), which comprises an asymmetrical opening (56) for regulating water flow through said water treating cartridge.
 13. The unit as set forth in claim 5; characterized in that said base (30) includes a drainage passage (31) with a plug (70) inserted therein.
 14. A countertop water treatment unit comprising at least a vertically oriented hollow water treating cartridge, filtrated water outlet means, a base having a means for receiving an end of said hollow water treating cartridge, and a removable housing with one open end enclosing said water treating cartridge on the base; characterized in that said base (30) includes: a combined means (40) extended downward for fastening said base (30) to a sink surface or the like, and for receiving water from a potable cold water supply line, and a valve (50) for controlling water flow through said water treating cartridge (20).
 15. The unit as set forth in claim 14; characterized in that said combined means (40) extended downward from said base (30) includes fastening thread (41) with a corresponding nut (65).
 16. The unit as set forth in claim 14; characterized in that said combined means (40), extended downward from said base (30), together with said base constitute a monolithic structure.
 17. The unit as set forth in claim 14; characterized in that said base (30) includes a drainage passage (31 a). 